Titel: Sjuksköterskors upplevelse av att arbeta med hastigt försämrade patienter efter genomförd ALERT-utbildning Bakgrund: Patienter som fått hjärt- och/eller andningsstillestånd på vårdavdelningar och som läggs in på intensivvårdsavdelning (IVA) har haft försämrade vitalparametrar redan 6-8 timmar innan ankomst till IVA. 50 % av dessa inläggningar hade kunnat förhindras om personalen på avdelningen haft rätt kunskap i att upptäcka varningssignaler och hur de åtgärdas. ALERT-utbildningen uppmuntrar till användandet av ett enkelt verktyg för bedömningen av patienter, vilket leder till ökat självförtroende och minskad ångest i hanteringen av akut sjuka patienter och intensivvård kan undvikas eller sättas in i rätt tid. Syfte: Att undersöka sjuksköterskors upplevelse av att arbeta med hastigt försämrade patienter efter genomförd ALERT-utbildning Metod: Intervjuer med tolv allmänsjuksköterskor på kirurgisk och medicinsk vårdavdelning. Insamlad data analyserades med kvalitativ innehållsanalys. Resultat: Vid analys av texten framkom totalt tre övergripande teman; Ökad förmåga till tidigare varseblivning, Känsla av ökad trygghet i sjuksköterskerollen och Upplevelse av ökad patientsäkerhet. Dessa teman mynnade ut i sex subteman; Tidiga varningssignaler uppmärksammas, Kontroller samt åtgärd vid hastig försämring, Ökat självförtroende, Viktigt med repetition, Struktur ger säkerhet i arbetet samt Sjuksköterskornas stöd för att bedöma olika vitalparametrar. Slutsats: Sjuksköterskorna upplever att ALERT-utbildningen ökar deras självförtroende och höjer patientsäkerheten, samt att regelbundna repetitioner är viktigt för att upprätthålla kunskapen.

Current manufacturing process controls are principally based only on statistical performance. The next evolution is to make physics based models combined with the state of the art sensors and actuators to control the manufacturing processes. In this paper, metal inert gas welding is used as an example of how the first steps in developing a reliable estimation technique to implement a physics based controller. The weld bead geometry will be the main focus because it is crucial to creating a quality weld. This paper uses an IR camera to generate and evaluate multiple weld bead width estimation techniques and characterizes their corresponding standard deviations. Also a Gaussian Mixture Model (GMM) is used to fit the temperature linescan data to fit an analytical function to the numerical data. The GMM is then used to estimate the weld bead width. Finally, the optimal linescan location is calculated to produce the best possible weld bead estimation. The result is that only one of the estimation techniques actually follows a step input and vi the optimal linescan location is 4 mm from the back of the arc. Furthermore, the GMM provides an excellent fit to the temperature linescan, but does not increase the accuracy of the estimate. / text

Bakgrund: Västvärlden har hög medellivslängd vilket inte bara innebär att människor är friska utan att de också finns många som lever med svåra sjukdomar och stort lidande. I Australien startades den Mobila Intensivvårds Gruppen, MIG-team för att minska dödlighet av akut sviktande patienter, som sedan infördes runt om i världen.   Syfte: Syftet med denna litteraturstudie var att beskriva sjuksköterskornas upplevelser av den mobila intensivvårdgruppen (MIG-team) samt National Early Warning Score (NEWS), samt beskriva de inkluderade artiklarnas datainsamlingsmetod.   Metod: Beskrivande litteraturstudie. De inkluderade vetenskapliga artiklarna söktes fram i databasen PubMed. Elva artiklar inkluderades som svarade på syftet. Artiklarna inkluderade både kvalitativ och kvantitativ ansats.   Huvudresultat: Många sjuksköterskor ansåg att kommunikationen var viktig. NEWS – National Early Warning Score sågs som ett viktigt verktyg för att effektivisera patientvården då kommunikationen blev snabb och exakt mellan sjuksköterskan och MIG-team. Detta ökade även patientsäkerheten genom att både hjärtstoppslarm och dödsfall har minskat. Sjuksköterskorna önskar överlag mer utbildning för att stärka den egna kompetensen. Det har påvisats att en del av sjuksköterskorna känner sig osäkra att hantera NEWS samt att de känner sig osäkra vid vilken tidpunkt de bör kontakta MIG-team. Osäkerheten skulle med största sannolikhet minska om de fick tillgång till mer utbildning samtidigt som det skulle stärka teamarbetet kring patienten. Datainsamlingsmetoderna i de inkluderade studierna var ett flertal intervjuer, en observationsstudie och datainsamlingar från olika dataprogram.   Slutsats: Kommunikation har visat sig ha stor betydelse både för att säkerhetsställa patientarbete och främja teamarbete i personalgruppen. Införande av NEWS och MIG-team runt om i världen har visats minska hjärtstopplarm och dödligheten på sjukhus, vilket skulle kunna motivera till ytterligare utbildning för sjuksköterskor i NEWS och MIG-team. / Background: In the west world it is a high life expectancy, which not only means thatpeople are healthy but that they also are many who are living with serious illnesses andgreat suffering. The Mobile Intensive Care Group (MIG team) started in Australia toreduce mortality from acute fragile patients, who then introduced around the world. Aim: To describe the nurse´s experiences of Rapid Response Team (MIG-team), andthe National Early Warning Score (NEWS), and to describe the data collection of theincluded articles. Methods: A literature study with descriptive design. The included scientific articleswere sought out in the PubMed database. Eleven articles were included who answeredthe aim. The articles included both qualitative and quantitative approach. Results: Many of the nurse´s concider that the communication was important. NEWSseen as an important tool to streamline patient care when communication was fast andaccurately between the nurse and the MIG- team. This also increased patient safety,which showed that both cardiac arrest alarm and deaths have declined. Nurses wishgenerally more education to enhance their skills. It has been demonstrated that some ofthe nurses feel insecure dealing with NEWS and that they feel uncertain when theyshould contact MIG -Team. The uncertainty would most likely decrease if they hadaccess to more education while it also would strengthen the teamwork around thepatient. Data collection methods in the included studies were several interviews, oneobservational study and data collection from various data programs. Conclusion: Communication has proved to be very important both to the collateralpatient work and promote teamwork in the personnel group. Introduction of NEWS andMIG teams around the world have been shown to reduce cardiac alarms and mortality inhospitals, which could warrant additional training in the MEWS and MIG team for thenurse´s.

Il existe aujourd'hui de nombreux procédés de soudage répondant à la très grande variété d'assemblage à réaliser et aux caractéristiques des métaux utilisés. Le premier chapitre décrit les différentes sources d'énergie utilisées en soudage. Suite à cela, une explication plus détaillée du soudage à l'arc électrique est donnée. Enfin nous présentons la conception d'une plateforme d'essai de soudage. Il est possible, bien sûr, d'utiliser une approche empirique pour optimiser un procédé. Néanmoins il y a des avantages à choisir une approche analytique puisqu'on peut en attendre des avancées significatives dans la compréhension des interactions dynamiques présentes dans l'arc. C'est pourquoi nous présentons dans le chapitre 2 les connaissances théoriques de la physique quant au comportement du métal liquide transféré en soudage MIG/MAG. Ce travail comporte donc également un aspect expérimental nécessaire à l'élaboration des bases de données utilisées pour la construction des modèles. Les différents enregistrements ont été effectués au CTAS sur une plate forme équipée d'un système d'acquisition de données pour les mesures de tension, courant, vitesse fil et d'un système de vidéo rapide. Le chapitre 3 présente notre recherche d'une méthode de segmentation permettant d'obtenir le suivi de variables pertinentes. Nous y proposons un capteur logiciel basé sur la théorie des contours actifs et montrons de bons résultats obtenus sur des vidéos expérimentales. Une étape d'ajustement de certains paramètres est indispensable. Elle est donnée dans le chapitre 4. Le simulateur créé permet d’interpréter certains phénomènes importants en soudage, de réaliser une étude de sensibilité « sans risque » et de donner les signatures théoriques de défauts. / Nowadays there is a lot of welding processes giving an answer to the great diversity of joints to realize and to the characteristics of the metals employed. The first chapter describes the different power sources used in welding. After that, a more detailed explanation of arc welding is given. Finally we present the design of a welding test bed. One can, of course, use an empirical approach to optimize a process. Nevertheless there are advantages in choosing an analytical approach since we can expect significant progress in the understanding of the dynamical interactions in the arc. That’s why we present in the second chapter the theoretical knowledge concerning the behaviour of the molten metal transferred during Gas Metal Arc Welding. This work involves as well an experimental aspect required for the elaboration of the databases used to build the model. The recordings were made at CTAS on a test bed equipped with an acquisition system for measuring voltage, current, wire feed speed and high speed videos. The third chapter presents our research of a segmentation method to measure some relevant quantities. We propose a software sensor based on the active contour theory and we show good results on experimental movies. An adjustment step of the model is needed and described in the fourth chapter. The created simulator allows us to interpret some important phenomena in welding, to make a sensitive study “without risk” and to give theoretical defects signatures.

"We are using genetic and molecular techniques to study a simple model organism, C. elegans, to determine the cues involved in the formation of the nervous system. Two molecules currently being studied in the laboratory play roles in the formation of the IL2 neurons, a class of sensory neurons in C. elegans. The first gene, dig-1, influences the sensory process or dendrite and is involved in adhesion as well as potentially providing directional information during development. The second gene, mig-10, influences the axon and may be involved in a cell signal cascade. Genetic screens of C. elegans using Ethyl methyl sulfonate (EMS) as a mutagen resulted in the isolation of mutants with defects in the IL2 sensory map; sensory processes followed aberrant paths, appearing to be defasciculated. Complementation tests showed that the mutations failed to complement n1321, a known allele of dig-1; thus, these new mutations were alleles of dig-1 (Ryder unpub. results). Several of these new alleles of dig-1, including nu336 and n1480, have been further studied to elucidate the role of this gene in sensory map formation. A dig-1 candidate gene was identified that encodes a protein that is a member of the immunoglobulin super-family (IgSF). The candidate gene is predicted to be a large gene, with a transcript of approximately 45Kb. The encoded protein contains three distinct regions and is similar to the hyalectan family of proteoglycans. N terminal region 1 contains immunoglobulin and fibronectin-like domains. Central region 2 is an area that is highly repeated with a potential to have GAGs attached. C-terminal region 3 contains domains associated with adhesion. Polymerase chain reaction (PCR) products from alleles nu336 and n1480 were amplified and sequenced from the candidate gene. The DNA lesion present in the candidate gene from both alleles fit the method for how that mutation was generated. The point mutation in allele nu336 removes a potential glycosylation site. The large re-arrangement in allele n1480 truncates the transcript, suggesting that the protein is also truncated. The sequencing results along with rescuing data (R. Proenca, personal communication) showed that the candidate gene for dig-1 was the gene of interest. Each of the alleles was further studied to determine how severe that allele was by looking at the neuronal process aspect and the brood size as well as displacement of the gonad. In general, alleles with severe defects in the nervous system also had severe gonad displacement, suggesting the gene functions similarly in the two tissues. To determine if the gene was expressed at the RNA level, reverse transcriptase polymerase chain reaction (RT-PCR) was used. Most of the RT-PCRs amplified a cDNA of the appropriate size that showed dig-1 was expressed at the RNA level. RT-PCR further suggested that all three regions were in one transcript as well as confirming part of the predicted exon structure to be correct. In addition, northern analysis showed the presence of a large transcript in wildtype worms as well as a smaller truncated transcript from allele n1480. To investigate developmental differences mixed stage of RNA and embryonic RNA from wildtype animals were compared using gene specific primers. The initial RT-PCR showed potential alternative splicing occurring at the 5? end of the gene during development. To examine expression at the protein level, two recombinant proteins from dig-1 were successfully made by cloning cDNA products from the 5?and 3? end of dig-1. The constructs were sequenced and shown to be in frame. The recombinant proteins (Ant1Con1 and Ant3Con3) were mass produced and sent to a commercial source for injection into pre-screened rabbits. Western analysis showed the presence of an antibody in the serum from two of the rabbits. These antibodies should prove useful in future determination of correctness of our models of DIG-1 function. IgSF members have been shown to have many roles in nervous system development. DIG-1 could act in either an attractive or a repellent role to position sensory processes during development. DIG-1 might also change its function over time; early in development DIG-1 could be adhesive and later become repellant as more sugars are added. The gene mig-10 is involved in sensory map formation. To localize MIG-10 expression, several transgenic animals were generated by injection of two constructs that should recombine in the worm to create a MIG-10::GFP fusion protein. Ten transgenic lines were generated and screened by PCR for the presence of the correct recombinant construct. If this construct makes functional, rescuing protein, the GFP expression should reflect the expression pattern of the MIG-10 protein."

Neuronal migration is an essential aspect of nervous system development; improper or incomplete neuronal migration can lead to debilitating disorders. The model organism Caenorhabditis elegans has 302 neurons and is ideal for studying nervous system development. The cytoplasmic adaptor protein, MIG-10, is necessary for the long range anteroposterior migration during embryogenesis of the neurons CAN, ALM, and HSN. Mutations in the mig-10 gene result in incomplete migrations of all three neurons. MIG-10 is a homologue of the vertebrate proteins lamellipodin and RIAM-1, which are involved in directing actin polymerization during axon outgrowth and guidance. RIAM-1 is known to interact with proteins from the Ras GTPase family. The MIG-10 protein has a pleckstrin homology (PH) domain, a Ras-associating (RA) domain, and a proline-rich region. We used a yeast two-hybrid system to investigate which Ras family proteins MIG-10 interacts with. Three isoforms of MIG-10, MIG-10A, MIG-10B, and MIG-10C, as well as the RAPH domain alone, were used as baits. No evidence of interaction was observed for any of the baits used. These results do not reject our hypothesis as the constitutively active Ras clones may need to be used or there may not be a direct interaction between MIG-10 and the Ras family members. We are currently screening a C. elegans cDNA library for interactions with all three isoforms of MIG-10. In the future we plan to investigate how MIG-10 may be involved in the WAVE/SCAR actin nucleation pathway.

Mobil Intensivvårds Grupp (MIG) är en relativt ny företeelse i Sverige, det har funnits i cirka 5 år, men forskning visar att den startades upp ungefär fem år tidigare i Australien. Det har även framkommit att efter MIGs konsultativa införande på sjukhus, har patienternas överlevnad påverkats till det bättre, patienternas ”outcome” påverkas på ett positivt sätt och liv kan ibland räddas. Att som sjuksköterska på vårdavdelning vårda en patient med sviktande vitala funktioner skapar en otrygghet och en stress som skapar en försämrad arbetsmiljö och därmed vårdmiljö. Syftet med studien är att genom en kvalitativ innehållsanalys undersöka på vilka sätt MIG påverkar vården. Metoden som använts i denna studie är en litteraturstudie där femton artiklar inkluderats och bearbetats. Resultatet visar att MIG har en betydelsefull roll i att främja kommunikationen och bygga broar mellan intensivvårdsavdelningar (IVA) och vanliga vårdavdelningar. MIG gör även avdelningssjuksköterskorna tryggare i sin yrkesroll, något som i sin tur givetvis gagnar patienterna. MIG kan ses som något av en spindel i nätet på sjukhuset, de knyter kontakter och förmedlar information mellan olika instanser. Respekten för MIG är stor, de har mångas förtroende och ses som en mycket stor resurs, som i och för sig kostar pengar, men som ger än mer vinster tillbaka. Det är viktigt att den som besitter kunskap bemöter den som rådfrågar med respekt och ödmjukhet, här har MIG ytterligare funktion att fylla vilket gör att broarna stärks än mer mellan avdelningarna. / Program: Specialistsjuksköterskeutbildning med inriktning mot intensivvård

A busca por alternativas para aumentar a resistência à oxidação ao ar a altas temperaturas de metais e ligas aumenta a cada dia, devido à necessidade de otimização da vida útil dos equipamentos que operam nestas condições. Novos materiais projetados para trabalhar nestas condições possibilitam reduzir custos de manutenção, aumentando a produtividade dos equipamentos, devido à redução do tempo de paradas programadas. O uso de aços inoxidáveis microligados a elementos terras raras é uma das alternativas adotadas, por exemplo, para tubulações para a indústria de petróleo e gás. Este trabalho estuda a resistência à oxidação ao ar a altas temperaturas de juntas soldadas de um aço inoxidável austenítico microligado ao cério. As juntas soldadas foram confeccionadas através do processo de soldagem MIG/MAG, depositando-se cordões de solda em chapas de aço inoxidável austenítico AISI 304L, variando-se a composição dos gases de proteção e mantendo-se os outros parâmetros de soldagem. Amostras dos diferentes metais depositados foram preparadas através de corte com disco diamantado e submetidas a ensaios de oxidação a altas temperaturas ao ar em balança termogravimétrica. Os corpos de prova oxidados foram estudados usandose microscópio óptico, microscópio eletrônico de varredura com EDS e difração de raios X. Observaram-se cinéticas de oxidação parabólicas em todas as temperaturas estudadas: 800, 900, 1000 e 1100 °C. Os Kps encontrados neste trabalho reforçam a tese de que ocorra a formação de películas protetoras de Cr2O3 e SiO2, o que reforça a hipótese que as mesmas tenham sido efetivamente formadas após os estágios iniciais de oxidação. Em todos os corpos de prova oxidados ao ar nas diferentes temperaturas, observou-se a formação de uma película não protetora de óxidos de ferro (Fe2O3, Fe3O4 e FeO) e posterior formação de uma camada protetora mais espessa de crômia (Cr2O3). Mais internamente observou-se a formação de SiO2. / The search for alternatives to increase the high temperatures oxidation resistance in air of metals and alloys increases every day due to the need to optimization of the life expectancy of equipment operating in these conditions. New materials designed to work in these conditions make it possible to reduce maintenance costs, increasing productivity of equipment due to reduced shutdowns. The use of austenitic stainless steel microalloyed with rare earth elements is adopted an alternative, for example, to tubes and pipes for the oil and gas industry. This work aims to study the high temperature oxidation resistance in air of welded joints of an austenitic stainless steel microalloyed with cerium. The welded joints were welded using MIG / MAG welding process, depositing weld beads on a sheet of austenitic stainless steel AISI 304L by varying the composition of the shielding gases. Samples of the different welded joints were prepared by cutting with a diamond disk and were subjected to high temperatures oxidation testing in thermogravimetric balance. The oxidized specimens were studied using optic microscopy, scanning electron microscope with EDS and Xray diffraction. Parabolic oxidation kinetics were observed at all temperatures studied: 800, 900, 1000 and 1100 °C. The Kps found in this work reinforce the thesis that the formation of protective films of Cr2O3 and SiO2 occurs, reinforcing the hypothesis that they have been effectively formed after the initial stages of oxidation. In all specimens oxidized at different temperatures, a formation of a non-protective layer of iron oxides (Fe2O3, Fe3O4 and FeO) and subsequent formation of a thicker protective layer of chromite (Cr2O3) was observed. More internally, SiO2 formation was observed.

Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-04-10T12:38:16Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) / Approved for entry into archive by Ana Rosa Silva (arosa@ufpa.br) on 2014-08-29T15:00:44Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) / Made available in DSpace on 2014-08-29T15:00:44Z (GMT). No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) Previous issue date: 2007 / Este trabalho apresenta um estudo experimental da viabilidade operacional, econômica, geométrica e da qualidade da solda com o uso do processo intitulado MAG-CW (Metal Active Gas–Cold Wire); entendido como: processo de soldagem MAG com adição de arame frio ou não energizado. Neste contexto, para o desenvolvimento deste trabalho utilizou-se os processos de soldagem MAG e o MAG-CW, sendo utilizados arames consumíveis sólidos de 1,2 mm de diâmetro, da classe AWS E-70S6 e o dióxido de carbono puro, CO2, como gás de proteção com vazão de 17 l/min, para os dois processos empregados. A soldagem automatizada foi realizada com o auxílio de uma fonte eletrônica ajustada em CC+, no modo tensão constante e interfaceada a um microcomputador. Para ambos os processos, os cordões de solda foram depositados sobre corpos de prova de aço carbono SAE 1020 medindo 76x155x12,7 mm, com passes em simples deposição, na posição plana puxando e empurrando o arco voltaico. Para o processo MAG-CW adicionouse o arame frio, na região do arco elétrico, por um sistema de alimentação auxiliar de arame de forma seqüencial Tandem e Twin, também, na posição plana. As variáveis de influência foram a Velocidade de Alimentação do Arame-Eletrodo, VAE, que variou em três níveis: 6, 7,5 e 9 m/min, respectivamente, a Velocidade de Alimentação de Arame Frio, VAF, que também variou em três níveis, sendo: 3, 4 e 5 m/min combinadas com VAE. As variáveis de resposta para a avaliação experimental foram a estabilidade do arco elétrico, as características econômicas, as características geométricas e a qualidade superficial do cordão de solda. Os resultados mostraram satisfatória estabilidade do arco, bem como, elevada produção em relação ao processo MAG e bom aspecto superficial das soldas. Neste sentido, o processo MAG-CW, quando comparado ao processo MAG, foi superior na taxa de fusão (TF) em 57% para a VAE igual a 6 m/min, 59 % para VAE igual a 7,5 m/min e de 53 % para a VAE igual a 9 m/min. Observou-se, ainda, que o mesmo ocorreu para a taxa de deposição (TD) aumentando em todos os níveis de velocidade: 62% para a VAE na condição igual a 6 m/min e 7,5 m/min e de 57 % para a VAE na condição igual a 9 m/min. A boa performance no aumento das taxas obtidas pelo processo MAG-CW demonstra vantagem, com maior evidência no desempenho destas características, em função da adição de arame frio ao arco. / The present study shows experimental research of the weld concerning operational, economic and geometric viability as well as its superficial quality when using MAGCW (Metal Active Gas – Cold Wire), understood as: MAG welding process with nonenergized wire or cold wire. For the development of this research, welding MAG and MAG-CW processes have been used together with 1,2 mm of diameter consumable solid wires, class AWS E-70S6 and carbon dioxide pure, CO2, as protection gas with 17 l/min release for both processes. Automated welding was performed with electronic source adjusted in CC+, in constant tension mode, interfaced by a microcomputer. In both processes the welds were put on steel carbon samples SAE 1020, 76x155x12,7 mm size, with simple disposition passes, pulling and pushing the voltage arc. The MAG-CW process added cold wire on the electric arc region, fed by the Tandem and Twin sequential wire shape auxiliary system on plane position. The variables of influence were: Velocidade de Alimentação do Arame-Eletrodo, VAE, which varied in three levels: 6; 7,5 and 9 m/min, respectively, Velocidade de Alimentação do Arame-Fio, VAF, which also varied in three levels: 3; 4 and 5 m/min combined with VAE. Response variables for experimental evaluation were electric arc stability, economic features, geometric features and weld superficial quality. The results demonstrated satisfactory arc stability as well as high production concerning MAG process and also good superficial aspect of welds. Rising rates obtained by MAG-CW process demonstrates the superiority due to non-energized wire addition to the arc. Thus, the MAG-CW process, in comparison with MAG process, demonstrated superiority concerning the 57% in rate of fusion (RF) for the VAE of 6 m/min, 59 % for the VAE of 7,5 m/min and 53 % for the VAE in 9 m/min. it has also been observed that the same occurred with the rate of deposition (RD) increasing in all speed levels: 62% for the VAE in both conditions of 6 m/min and 7,5 m/min and in 57 % for the VAE in 9 m/min. The good performance in the increase of the taxes obtained by the process MAG-CW demonstrates advantage, with larger evidence in the acting of these characteristics, in function of the addition of cold wire to the arch.

Distorções geométricas em partes metálicas unidas através de soldagem a arco elétrico são consequências inerentes ao processo devido ao elevado fluxo de calor necessário para fusão dos metais de base e adição (quando houver). Embora inevitáveis, estas distorções podem ser reduzidas ou eliminadas através do prévio conhecimento do comportamento da junta de acordo com energia aplicada, características geométricas, propriedades do material, entre outros fatores, possibilitando assim a redução de custos com possíveis retrabalhos por meio de alterações de projeto ou ações que as previnam durante a soldagem. Este trabalho utilizou a metodologia de Projeto de Experimentos para avaliar o efeito da energia de soldagem, espessura da aba e espessura da alma na distorção angular em juntas de filete soldadas pelo processo MIG/MAG com modo de transferência curto-circuito. Foi aplicada a Análise de Variância para as distorções angulares das amostras e identificou como significativo o efeito linear da energia de soldagem, o efeito quadrático da espessura da aba e a interação dos fatores energia de soldagem e espessura da aba na distorção angular de juntas de filete. Observou-se mínimas distorções para a combinação de maior energia de soldagem e menor espessura de aba, sendo mínimas também as distorções angulares para a combinação de menor energia de soldagem e maior espessura de aba, independente da espessura da alma para as condições estudadas. Através das macrografias das amostras, identificou-se que razão entre a área total do metal de solda e espessura da aba que gera maior distorção angular é aproximamente 5, com menores distorções angulares para valores inferiores e superiores a esse. Através de um modelo numérico, demonstrou-se que o gradiente de temperatura na aba da junta não determina a máxima distorção angular, e sim a máxima temperatura atingida na superfície inferior da aba, com máxima distorção angular obtida para a amostra que atingiu aproximadamente 425 ºC em ponto na superfície inferior da aba e paralelo à margem do cordão. Por fim, para distorções angulares em função da razão entre a energia de soldagem conduzida pela aba e espessura de aba ao quadrado, observou-se que a distorção angular é crescente até atingir 15,00 J/mm³, e menores distorções angulares para relações superiores a esse valor. / Welding deformation on metallic parts joined by electric arc welding are inherent consequences of the process due to the high heat flux required for melting the base and filler metals (when used). Although unavoidable, these deformations can be reduced or eliminated through prior knowledge of joint behavior in accordance with applied heat input (welding energy), geometric characteristics, material properties, among other factors, thus reducing costs with possible rework through design changes or actions that prevent them during welding. This work uses a methodology proposed by Experimental Design theories to evaluate the effect of heat input, flange thickness and web thickness on angular distortion in fillet joints welded by the GMAW process with short-circuit transfer mode. Was applied Analysis of Variance for the angular distortions of the test specimens and there are significant the linear effect of heat input, the quadratic effect of flange thickness and the interaction of heat input and flange thickness on the angular distortion of fillet joints, observing minimum distortion for the combination of higher heat input and lower flange thickness, and also angular distortions for the combination of lower heat input and higher flange thickness, regardless of the thickness of the web are minimal. Through the macrographs of the samples, it was identified that the ratio of a region of the weld metal to the flange thickness that generates the greatest angular distortion is approximately 5, with smaller angular distortions for lower values and higher than that. Through a numerical model, it has been shown that the temperature gradient in the flange does not determine the maximum angular distortion, but the maximum temperature reached in the lower surface of the flange, with maximum angular distortion obtained for the sample that reached approximately 425ºC in point on the surface bottom of the flange and parallel to the edge of the weld bead. Finally, for angular distortions as a function of the ratio between the heat input conducted by the flange and the squared flange thickness, it was observed that the angular distortion is increasing until reaching 15,00 J/mm³, and smaller angular distortions for higher relations to this value.